Light emitting device
A light emitting device includes a laser diode that emits a blue light, and a wavelength conversion part that absorbs a part of light emitted from the laser diode and converts a wavelength thereof. The wavelength conversion part includes a YAG-based single crystal phosphor. Irradiance of light emitted from the laser diode and irradiated on the wavelength conversion part is not less than 80 W/mm 2 .
1. A light emitting device, comprising:
a laser diode that emits a blue light;
a wavelength conversion part that absorbs a part of light emitted from the laser diode and converts a wavelength thereof; and
a lens that condenses light emitted from the laser diode,
wherein the wavelength conversion part comprises a YAG-based single crystal phosphor,
wherein irradiance of light emitted from the laser diode and irradiated on the wavelength conversion part is not less than 80 W/mm 2 , and
wherein light condensed by the lens is irradiated on the wavelength conversion part.
2. The light emitting device according to claim 1 , wherein the wavelength conversion part comprises a single piece of the single crystal phosphor.
3. The light emitting device according to claim 1 , wherein the wavelength conversion part comprises a plurality of particles of the single crystal phosphor that are bound to each other by a binder.
4. The light emitting device according to claim 1 , wherein the wavelength conversion part is held by a heat dissipation member that comprises aluminum nitride, alumina, SiN, Cu or Al and dissipates heat generated from the wavelength conversion part.
5. A light emitting device, comprising:
a laser diode that emits a blue light;
a wavelength conversion part that absorbs a part of light emitted from the laser diode and converts a wavelength thereof; and
an optical waveguide that transmits light emitted from the laser diode,
wherein the wavelength conversion part comprises a YAG-based single crystal phosphor,
wherein irradiance of light emitted from the laser diode and irradiated on the wavelength conversion part is not less than 80 W/mm 2 , and
wherein light transmitted through the optical waveguide is irradiated on the wavelength conversion part.
6. The light emitting device according to claim 5 , wherein the wavelength conversion part comprises a single piece of the single crystal phosphor.
7. The light emitting device according to claim 5 , wherein the wavelength conversion part comprises a plurality of particles of the single crystal phosphor that are bound to each other by a binder.
8. The light emitting device according to claim 5 , wherein the wavelength conversion part is held by a heat dissipation member that comprises aluminum nitride, alumina, SiN, Cu or Al and dissipates heat generated from the wavelength conversion part.
9. A light emitting device, comprising:
a laser diode that emits a blue light; and
a wavelength conversion part that absorbs a part of light emitted from the laser diode and converts a wavelength thereof,
wherein the wavelength conversion part comprises a YAG-based single crystal phosphor,
wherein irradiance of light emitted from the laser diode and irradiated on the wavelength conversion part is not less than 80 W/mm 2 , and
wherein the single crystal phosphor has a composition represented by a compositional formula
(Y 1-a-b Lu a Ce b ) 3+c Al 5-c O 12 (0≤ a≤ 0.9994,0.0002≤ b≤ 0.0067,−0.016≤ c≤ 0.315).
10. The light emitting device according to claim 9 , wherein the wavelength conversion part comprises a single piece of the single crystal phosphor.
11. The light emitting device according to claim 9 , wherein the wavelength conversion part comprises a plurality of particles of the single crystal phosphor that are bound to each other by a binder.
12. The light emitting device according to claim 9 , wherein the wavelength conversion part is held by a heat dissipation member that comprises aluminum nitride, alumina, SiN, Cu or Al and dissipates heat generated from the wavelength conversion part.